Study about Hainengliang ——a new kind of disinfectant applied in Prawn culture

海能量是一种新型高效杀菌剂，本文研究了其对水质理化因子的改善、对有害藻的去除、对养殖生物的毒性及对养殖水体中有害病菌的去除效果，评价了其在对虾养殖中的应用效果。主要研究结果如下： 1.海能量的最佳使用浓度为250mg/L，在此浓度下，水质指标好转，水体污染有所缓解。使用海能量5~10min后，水中亚硝酸盐氮、铵氮和硝酸盐氮显著下降，最大降低率分别可达40.3%、36.7%和24.2%；pH略为增加；加入海能量6h内溶解氧略有增加，增氧效果不是很明显；加入海能量12h内，COD显著降低，降低率最大为74.6%。 2.海能量对虾池水面漂浮绿藻及铜绿微囊藻的去除效果很好，3h之后灭杀率即可达到9...Hainengliang is a new kind of disinfectant. In this paper, the effect of Hainengliang on improving the quality of culture waters, eradicating the harmful algae and killing the deleterious pathogens were studied. At the same time, the toxicity of Hainengliang to cultured organisms was researched as well. According to these conclutions, the effectiveness of it in the prawn culture were analyzed and ...学位：理学硕士院系专业：海洋与环境学院海洋学系_海洋化学学号：20042701

主要资源国家政治生态情况及其对铝土矿政策的影响

Vesuvius, dominating the densely-populated Neapolitan area, is one of the most dangerous volcanoes in the World. Its destructive power derives from energetic subplinian and plinian eruptions, such as the one which occurred in 79 A.D. Generally such large-scale events follow a long period of quiescence; a behaviour interpreted as the gradual build-up of magma volumes between periods of major activity. After the 1631 subplinian eruption until the last 1944 A.D. eruption, it experienced an almost continuous and less energetic explosive/effusive activity. The erupted magmas are characterized by undersaturated potassic to ultrapotassic nature, and compositional and Sr-isotopic variability. Furthermore geobarometric studies indicate two different crystallization depths located at 4 and >11 km, respectively. According to most of the recent literature, the eruptions were triggered by the injection in a shallower magma chamber, of isotopically distinct magma batches derived from heterogeneous mantle source(s) and/or contamination processes occurred within the deep reservoir. In our review of petrochemical data, we consider the period between the 3550 years BP plinian eruption and the 472 A.D. sub-plinian eruption, which includes 79 A.D. event, and the most recent period of activity which started in 1631 A.D. and lasted up to the 1944 A.D. eruption, characterized by a near continuous effusive/explosive activity. For both periods we identify a correlation between Sr-isotopical features of magmas and their crystallization depth. In particular, we show that pyroxenes have Sr-isotopic ratios lower than 0.7074 and an equilibrium crystallization depth of 22-11 km. Moreover feldspars have higher 87Sr/86Sr values (0.7075-7) and an equilibrium crystallization depth of about 4 km. Therefore the most radiogenic magmas did not derive from a deeper reservoir but their higher Sr-isotopic ratios have been acquired at a shallower depth likely by crustal contamination during magma evolution. In contrast, the lower Sr-isotope compositions characterise the less contaminated magmas coming from deeper crustal levels. On the basis of this evidence, the temporal Sr-isotopical variation of magma which erupted in the 1631-1944 A.D. period probably derives from the progressive withdrawal of the shallow magma chamber, which was completely empty before the 1805-1944 A.D. period of volcanism. Therefore the effusive and explosive events of the most recent 1805-1944 A.D. period were fed directly by the deep reservoir located at a depth exceding 11 km